#include <iostream>
using namespace std;

int main() {
    double r,pai,d,c,s;
    cin >> r;
    pai = 3.14159;
    d = 2 * r;
    c = 2 * pai * r;
    s = pai * r * r;
    printf("%.4f", d);
    printf(" %.4f", c);
    printf(" %.4f", s);
    return 0;
}